<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    文本框： <input type="text" id="nameFiled">
    <script>
        var nameFiled = document.getElementById("nameFiled");
        nameFiled.onkeydown = function() {
            console.log('我是onkeydown');
        }
        nameFiled.onkeypress = function() {
            console.log('我是onkeypress');
        }
        nameFiled.onkeyup = function() {
            console.log('我是onkeyup');
        }
    </script>
</body>

</html>